Occupants of the International Space Station experience weightlessness due to
A) the absence of Earth gravity at that altitude.
B) the absence of a support force.
C) rotation of the station.
D) no inertia in space.
Answer: B
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Blackbody radiation is emitted from a small hole in a furnace
a. True b. False Indicate whether the statement is true or false
Whether a truck comes to a stop by crashing into a haystack or a brick wall, the stopping force is
A) greater with the haystack. B) greater with the brick wall. C) both the same
Which of the following is a negatively charged polyatomic ion?
a. Ammonium ion b. Oxide ion c. Sodium ion d. Nitrate ion
A uniform beam having a mass of 60 kg and a length of 2.8 m is held in place at its lower end by a pin. Its upper end leans against a vertical frictionless wall as shown in the figure. What is the magnitude of the force the pin exerts on the beam?
a.
0.68 kN
b.
0.57 kN
c.
0.74 kN
d.
0.63 kN
e.
0.35 kN